3 years ago

Readioactive elements have unstable ______

Chemistry

1 answer:

dalvyx [7]3 years ago

4 0

<span>Radioactive elements have an unstable nucleus, this causes them to decay.</span>

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Which of the following substances can be decomposed by chemical change?

vovangra [49]

NaCl can be decomposed by electrolysis

Na, Cl2 and K are in the simplest form and they cannot be decomposed

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4 years ago

Calculate the number of molecules <br> 2.62x10^-6g of water, H2O

bagirrra123 [75]

87.33 X 10^15 molecules

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4 years ago

. Metallic iron has a body-centered cubic lattice with all atoms at lattice points and a unit cell whose edge length is 286.6 pm

adell [148]

Answer:

$\large \boxed{\text{55.8 u}}$

Explanation:

1. Calculate the volume of the unit cell

V = l³ = (2.866 × 10⁻⁸ cm)³ = 2.354 × 10⁻²³ cm³

2. Calculate the mass of a unit cell

$\text{Mass} = 2.866 \times 10^{-23}\text{ cm}^{3} \times \dfrac{\text{7.87 g}}{\text{1 cm}^{3}} = 1.853 \times 10^{-22} \text{ g}$

3. Calculate the mass of one atom

A body-centred unit cell contains two atoms.

$\text{Mass of 1 atom} = \dfrac{1.853 \times 10^{-22} \text{ g}}{\text{2 atoms}} \times \dfrac{\text{1 u}}{1.661 \times 10^{-24}\text{ g}} = \textbf{55.8 u}\\\\\text{The molar mass of Fe from the Periodic Table is $\large \boxed{\textbf{55.845 g/mol}}$}$

6 0

4 years ago

Help me with these problems please.

bagirrra123 [75]

Answer: 6751 L

Explanation:

1000 mL = 1 L

so dividing 6751 by 1000 gives .6751 L

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3 years ago

2) Examine the molecules below.<br> Circle the molecules that can also be classified as compounds.

sergejj [24]

Answer:

3rd

Explanation:

its the way they look

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3 years ago